Structural, magnetic and Mossbauer spectral studies of Sm~(3+) ions doped Mg ferrites synthesized by solid state reaction technique

摘要

Sm~(3+) ions doped MgSm_xFe_(2-x)O_4 (x = 0.0, 0.05 and 0.1) ferrites have been synthesized by solid state reac tion technique. Micro-structural and magnetic properties have been investigated at room temperature by means of X-ray diffraction, scanning electron microscope, Vibrating sample magnetometer and Mossbauer parameter measurements. The addition of samarium in Mg ferrite has been shown to play a crucial role in improving the dc resistivity and magnetic properties. Lattice constants have been found to be increasing with an increase in samarium ions concentration in Mg ferrite. The values of saturation magnetization, residual magnetization and hyperfine magnetic field have been decreased due to the dop ing of Sm~(3+) ions in Mg ferrite. Mossbauer spectra of all the samples exhibit normal Zeeman split sextets show the ferromagnetic behavior of the ferrites. Variations of Mossbauer parameters such as isomer shift, quadrupole splitting and hyperfine magnetic field with Sm~(3+) ions concentration have been studied and discussed in details. Mossbauer study is also supported by cation distribution, magnetization verses applied field curve and initial permeability measurements. The mechanisms responsible to these results have been discussed in this paper.